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* sysdeps/generic/dl-osinfo.h (_dl_setup_stack_chk_guard): Take

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one parameter.  If non-NULL use it to initialize return value.
	(_dl_setup_pointer_guard): New function.
	* sysdeps/unix/sysv/linux/dl-osinfo.h: Likewise.
	* sysdeps/generic/ldsodefs.h: Declare _dl_random.
	* elf/rtld.c (security_init): Pass _dl_random to
	_dl_setup_stack_chk_guard.  Call _dl_setup_pointer_guard to initialize
	pointer_chk_guard.
	* elf/dl-sysdep.c (_dl_random): New variable.
	(_dl_sysdep_start): Handle AT_RANDOM.
	(_dl_show_auxv): Likewise.
	* elf/dl-support.c (_dl_random): New variable.
	(_dl_aux_init): Handle AT_RANDOM.
	* csu/libc-start.c [!SHARED] (libc_start_main): Pass _dl_random
	to _dl_setup_stack_chk_guard.

	* elf/elf.h (AT_RANDOM): Define AT_BASE_PLATFORM and AT_RANDOM.
This commit is contained in:
Ulrich Drepper
2009-01-11 04:44:06 +00:00
parent 5b656a0d30
commit 965cb60a21
7 changed files with 112 additions and 31 deletions
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7
elf/dl-sysdep.c
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@ -1,5 +1,5 @@
/* Operating system support for run-time dynamic linker. Generic Unix version.
Copyright (C) 1995-1998, 2000-2007, 2008 Free Software Foundation, Inc.
Copyright (C) 1995-1998, 2000-2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -62,6 +62,7 @@ int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion
void *__libc_stack_end attribute_relro = NULL;
rtld_hidden_data_def(__libc_stack_end)
static ElfW(auxv_t) *_dl_auxv attribute_relro;
void *_dl_random attribute_relro = NULL;
#ifndef DL_FIND_ARG_COMPONENTS
# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
@ -173,6 +174,9 @@ _dl_sysdep_start (void **start_argptr,
GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
break;
#endif
case AT_RANDOM:
_dl_random = (void *) av->a_un.a_val;
break;
#ifdef DL_PLATFORM_AUXV
DL_PLATFORM_AUXV
#endif
@ -294,6 +298,7 @@ _dl_show_auxv (void)
[AT_SECURE - 2] = { "AT_SECURE: ", dec },
[AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex },
[AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex },
[AT_RANDOM - 2] = { "AT_RANDOM: 0x", hex },
};
unsigned int idx = (unsigned int) (av->a_type - 2);